Elastic band ligation device for treatment of hemorrhoidal tissue including an inner tubular member for retaining a stretched elastic band over the front end thereof a plunger in the tubular member with a handle for generating a suction for drawing hemorrhoidal tissue into the inner tubular member through the opening at the front end and an outer tubular pusher sleeve with a limited friction fit over the inner tubular member with an external end adjacent the stretched elastic band. A thumb pusher is provided on the pusher sleeve to allow the operator to push the outer tubular pusher sleeve towards the front end of the inner tubular member or to secure the outer pusher sleeve and withdraw the inner tubular member which deploys the elastic band from the front end of the inner tubular member onto hemorrhoidal tissue drawn into the inner tubular member. The outer tubular pusher sleeve has a locking mechanism including a manually actuated tab connected to the outer tubular pusher sleeve for locking the outer tubular pusher sleeve to the inner sleeve to prevent relative movement of the outer sleeve and inner tubular member until the outer pusher sleeve is unlocked by the user thereby preventing premature deployment of an elastic band.
